In this excel activity each pupil has a 5x5 grid onto which they will paste their clues. On the back they work on primes and triangle numbers etc. A new clue is given out every day - I’m going to put the clues in one of those textile advent calendars with labelled pockets - 3 on Friday? They paste their answer onto the right bit on their grid. Ideal for KS2 and KS3 students.